Shift end, posted by Adam Round on 13 Sep 2024, 23:17
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On Shift: TS, FT, CK, AR, PS
X-ray delivery
8.951 keV, 1.6 mJ up to 200 pulses at 0.5 MHz (intesity drops off at end of train) |
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Shift end, posted by Raphael de Wijn on 23 Nov 2024, 07:09
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End of in-house 8496
X-ray delivery
15.13 keV 30 pulses @0.5 MHz and 64 pulses (customized pattern), 0.85-1.0 mJ stable delivery |
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SASE3 end of shift summary, posted by Antje Trapp on 22 Jul 2024, 15:27
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this morning, ZZ was done together with Sylvia Huynh (EEE) to solve softmono pre-mirror motor issue https://redmine.xfel.eu/issues/177392
The issue was solved and also mechanical functionality of the stage was checked.
After ZZ, the beamline remained interlocked. Hutches will be searched and closed tonight to allow final checks on Tuesday |
SASE2 end of shift summary, posted by Antje Trapp on 22 Jul 2024, 15:20 
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Beam is now aligned back to HED for hand-over to Naresh (see picture)
points achieved:
-vibometer measurements on M2 at high energy, 2,1 and 3 mrad setting |
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SASE1 MIRROR MOTORS CALIBRATED, posted by Antje Trapp on 11 Apr 2024, 21:54
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Dear all,
we calibrated the mirror vertical motors to their geometrically neutral.
Please be aware that saved values for beamline settings may no longer be valid. This mainly applies to the vertical motor positions, but will |
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SA2 status, posted by Jan Gruenert on 20 Apr 2024, 23:58
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20.4.2024 / 22h51:
DOC informed PRC that the SASE2 topic broker had to be restarted.
The EPS power limit was reset by PRC to the previous value of 40 W. |
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SA2 status, posted by Frederik Wolff-Fabris on 04 Nov 2024, 15:07
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Dear MID colleagues, Svitozar (PRC), Bolko and Shan (RCs),
This morning we faced the situation where MID was limited to 400 pulses (mode M) via the EPS signals. The current RF window set at the machine
allows to the requested 450 pulses. |
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SA1 status, posted by Frederik Wolff-Fabris on 31 Jan 2024, 11:24
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A ZZ is taking place today, 31.01 at 11:30, in XTD9 to verify and fix the M3 Pop-in screen which is currently blocking the beam. It is not
yet clear if this is an electrical or mechnical problem.
** Update 13:05: ZZ intervention is finished and successful. A mechanical issue due to a loose coupling between motor and spindle was fixed. |
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SA1 status, posted by Peter Zalden on 28 Feb 2024, 08:57
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5.61 keV setpoint in SA1 was confirmed to correspond to 5.660 keV (+/- 0.003 keV), see attached.
The user expt #5644 can proceed as planned. |
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SA1 status, posted by Peter Zalden on 21 Sep 2024, 09:50
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The xray beam drifted significantly on wednesday and thursday (18. and 19.) but then was not drifting on friday (20.), see attached trendline of the
M2 actuator that kept the beam at fixed position on M3.
Today also seems that beam pointing is stable. But unclear what happened earlier... |
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SA1 status, posted by Peter Zalden on 28 Oct 2024, 09:58
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This is to report some findings during operation that should be looked into (mostly to avoid in the future, because both negatively affect data quality
of the user expt at FXE):
At the moment, the 99:1 mode affects 4 to 5 pulses out of 100 in SA1, see first screenshot that shows in the top right the IPM reading |
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SA1 status, posted by Andreas Koch on 26 Nov 2024, 09:47
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Concerning damage of the SA1 FEL imager, Operation-2024 eLog #206
The screen position of the YAG screen - when pressing the screen selection button - has been moved by 1 mm so that the damaged area is out of the |
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M3 calibration, posted by Kelin Tasca on 10 Apr 2024, 17:03
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- M3 TX moved to 0 in steps of 1 mm and beam on FXE Pop-In corrected with M3 RY (+) and M2 RY
- Started calibration with M3 Rz in steps of 0.5 (+) and corrected with M2 RY and RZ to find a position with a minimum of parasitic motion
- Iterations with M3 TY |
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M1 Rz damaged - DO NOT MOVE!!!, posted by Antje Trapp on 30 Aug 2024, 13:02 6x
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What has happened:
During euler motion calibration of M1, we were driving the vertical motors by a few mm back and forth. At some point, the Rz motor went into error,
as we attempted to go further in negative direction. Resetting the axis several times did not solve the problem. The vertical motors were then moved to |
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M1 - M2 - M3 euler fine tuning geometriy parameters, posted by Antje Trapp on 19 May 2024, 14:49
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We fine tuned geometry parameters for linear effects on X motion (parallel offset) for all three mirrors.
dTz was corrected for M2 and M3 to -6.5mm (same geometry)
dTz was corrected for M1 to +6mm |
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Issue, posted by Jan Gruenert on 28 Jan 2024, 13:50
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RC / BKR informs : Beam is down (since 12h10), all beamlines affected
The reason is failure of a quadrupole (power supply) downstream of the dogleg.
The MPS crew is working on recovery, access to XTL ongoing. |
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Issue, posted by Romain Letrun on 01 Feb 2024, 21:56
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At 21:29:20 today, the number of bunches in SASE1 was increased from 1 to 352 without intervention of the SPB/SFX shift crew. 30 seconds later, the number
of bunches was reduced to 1, again without intervention from the SPB/SFX shift crew (see attachments 1 and 2).
We were in the middle of a measurement at that time and the sudden increase from 10 mW to 3.5 W average power resulted in the destruction of |
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Issue, posted by Romain Letrun on 13 Feb 2024, 08:52
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| Like after the previous winter maintenance period, the shutter of FXE appears as opened in DOOCS panels even though it is closed (https://in.xfel.eu/elog/OPERATION-2023/58). |
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Issue, posted by Tommaso Mazza on 17 Feb 2024, 08:15
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The cross on the FEL imager, which we use as a reference for BKR crew, is not centred on the GATT aperture. when was this changed, and why?
att. 1 and 2 show the current position (the saturated image aids the positioning of the GATT aperture).
att. 3 is from two weeks ago. then, the cross was centred on the GATT aperture. |
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Issue, posted by Romain Letrun on 27 Feb 2024, 09:56 8x
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The status of the XTD2 attenuators has been checked during the experiment last week and many were found to cause disturbances in the wavefront ranging
from mild to severe.
Attachment 1: No attenuator |